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Rearward-Slanted Cylinder Design
The WR450F’s distinct rearward-slanted cylinder design—complete with rear exhaust and forward-mounted intake system—features a cylinder head that works with the frame geometry for optimized weight distribution. Inside, the engine features a straight intake tract, aggressive cam profiles, high-compression “box bridge” piston design with DLC-coated piston pin, and more.
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Unique Enduro Engine Tuning
WR450F-specfic ignition and fuel injection maps are optimized for enduro riding and racing, for exceptionally smooth and controllable midrange power with longer-lasting pulling power in the top-end.
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Enhanced Intake and Exhaust Systems
The WR450F features a new two-piece air filter with improved sealing that works in conjunction with the tuned intake tract length and new WR-specific muffler to boost the linear feeling of traction and drive.
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High-Capacity Radiator
The WR450F uses a large radiator with excellent cooling capacity shared with the YZ450F motocrosser, complete with a cooling fan for consistent performance during the toughest enduro rides.
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Electric Starter System
The WR450F features a compact electric starter system to simplify restarts on the trail and add convenience everywhere else.
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Advanced Fuel Injection
The engine breathes through a 44mm Mikuni® throttle body fed by a high pressure electric pump to ensure optimum fuel atomization and power for a wide range of riding conditions.
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Robust Transmission and Clutch
The 2019 WR450F’s wide-ratio 5-speed transmission is shared with the YZ450FX and enhances cross country performance for more flexible gearing selection in open terrain. The clutch system has also been reworked especially for the new WR450F for improved heat dissipation and lighter clutch lever effort.
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